ST. PAUL, Minn. (AP) — Gov. Mark Dayton is spelling out the conditions under which he'll call a special session.

Dayton says he agrees a special session is necessary to finish "urgent priorities" left undone when the Legislature adjourned last month.

He wrote to legislative leaders Wednesday to spell out requirements including spending significantly more on transportation than what he calls the "embarrassingly short" $300 million approved by House Republicans. And Dayton insists that mass transit projects need to be part of it.

Dayton also listed more than a dozen specific programs or construction projects that must be guaranteed before he calls a special session.

And he warned that a drafting error in the tax bill could cost the state about $102 million in revenue over the next three years, and must be fixed.